BEIJING (Reuters) – Chinese aluminum foil producer Shantou Wanshun Package Material Stock Co on Monday said its subsidiary is suing the United States over twin anti-dumping and anti-subsidy duties Washington imposed on its shipments.

In a statement to the Shenzhen Stock Exchange, Wanshun said Jiangsu Zhongji Lamination Materials, which was hit with a countervailing duty of 17.14 percent and an anti-dumping duty of 37.99 percent earlier this year, had filed a lawsuit with the U.S. Court of International Trade.

Zhongji was among the Chinese foil companies that unsuccessfully filed a joint “no injury” claim with the U.S. International Trade Commission last year as Washington probed whether the companies were unfairly subsidised, and is now trying to reverse the duties on its own.

The total duties of 55.13 percent on Zhongji’s foil were the lowest imposed on Chinese foil makers, Wanshun’s Board Secretary Huang Wei told Reuters. This shows the U.S. side had taken some of its arguments into account, she said.

“But there are still some unreasonable elements inside” the ruling, she said. Huang pointed to the United States comparing the prices of China’s aluminium foil exports to South Africa as a reference case.